There are also some interesting connections between the demixing approach proposed in [1]} and our approach to initializing NMF, which is based on the sparse projection algorithm (SPA).
[2]}, [3]} discuss the relationships between SPA and group-sparse dictionary selection methods related to the approach used in [1]}; thus the methods we use to compute “pure" superpixels and the methods used in [1]} to select neural dictionary elements are closely related. However, our denoise-then-superpixelize approach to seeding the dictionary of neural temporal components is in a sense converse to the clustering approach developed in [1]} for seeding the dictionary of neural spatial components. There may be room to fruitfully combine these two approaches in the future.
